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DNA Structure and Replication

DNA Structure and Replication
DNA with a G-C content of 50% will melt at approximately

90 °C
60°C
100 °C
70 °C

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DNA Structure and Replication
In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%?

Decreases
Remains same
Can not be compared
Increases

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DNA Structure and Replication
Which of the following enzyme adds complementary bases during replication?

Helicase
Polymerase
Replicase
Synthesase

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DNA Structure and Replication
DNA polymerases I also has

5'-3' exonuclease activity
5'-3' endonuclease activity
3'-5'exonuclease activity
both (a) and (b)

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DNA Structure and Replication
After one replication in 15N, how many bands should be observed in a cesium chloride gradient?

Two
One
Three
A smear

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DNA Structure and Replication
What is the approximate size (in kb) of the E. coli genome?

3000 kilobase
4500 kilobase
5500 kilobase
6500 kilobase

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